Would filtering YouTube make it more liable?

Liz Gannes at New Tee Vee: Would Filtering YouTube Make it More Liable?

YouTube’s defense against claims of copyright infringement has long been the safe harbor of the Digital Millennium Copyright Act, which clears service providers from liability related to material transmitted through their systems (see text).

But if Google were to implement copyright filters, proactively screening content before it’s posted to the site, would YouTube leave the safe harbor of DMCA? That’s what some competitors in the video-sharing space have told me scares them about hiring Audible Magic or someone else to police their sites.